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Sodium Hydroxide Solution: Normal Caustic Soda, 40 g per Litre (Sutton, 1904)
The standard normal (1 M) caustic soda solution for titration: 40 g NaOH in each litre. Make it a little too strong, check it against normal acid, bring it to exact strength and keep it away from the air, which it takes carbon dioxide from.
Result: normal sodium hydroxide solution, its strength proved by titration.
Source: F. Sutton, A Systematic Handbook of Volumetric Analysis (1904), p. 48. Picture: that page of the book.
Baguhan
Unknown
Mga Tagubilin
1
1
Dissolve the caustic soda
Dissolve the caustic soda
Dissolve pure caustic soda in distilled water until the solution has a specific gravity of about 1.05, about 50 g to the litre: a little stronger than normal (40 g to the litre). Expose it to the air as little as possible.
Mga materyales para sa hakbang na ito:
Sodium Hydroxide — Uring Panlaboratoryo1 about 50 g per litre
Distiladong Tubig1 solventMga kailangang kasangkapan:
Silindrong may sukatan2
2
Titrate and adjust
Titrate and adjust
Estimate its strength roughly with normal acid and methyl orange. Then titrate 50 ml of it exactly against normal acid and adjust it to exact normal strength. Methyl orange works cold even if the solution has taken up some carbon dioxide; with litmus or phenolphthalein, titrate boiling. Not given: the dilution, implied by the adjustment. Ours: hydrochloric acid as the normal acid; methyl orange as the pH indicator solution.
Mga kailangang kasangkapan:
Hydrochloric acid
Solusyong Pantukoy ng pH
Bureta (salamin)
Pipeta3
3
Store it
Store it
Once its strength is settled, keep it in a bottle that shuts out the air, or in full bottles with their glass stoppers lightly greased with vaseline.
Mga kailangang kasangkapan:
Boteng salamin (malinaw)
BaselinaMga Materyales
2- 1 about 50 g per litrePlaceholder
- 1 solventPlaceholder
Mga Kinakailangang Kasangkapan
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